It sounds like you might be trying to deceive people as to what they are getting... that is never going to go well for you.
Make sure to let people know up front what they are getting, and you should be fine. If you have the ability, you might consider adding a "free preview week" option to your paid channel that allows subscribed users to view ad-free for a set period, and at the end of that period they can upgrade to paid or continue with ads, plenty of other video services do this. Most of us are subscribed to netflix because we tried the free month and decided it was worth the cost.
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